Big Ass Fans’ PowerFoil X2.0 features a NitroSeal drive system for maximum durability and cool operation. The patented NitroSeal drive is nitrogen-filled and hermetically sealed to create the ideal internal environment, keeping contaminants out for zero maintenance. The PowerFoil X2.0, available in sizes ranging from 8’ to 24’, is designed to provide the most reliable air movement solution for large spaces. The fan comes with a 15-year, non-prorated warranty, and includes the company’s Factory Certified Installation.